Trunk circuit control arrangement for a communication switching system

ABSTRACT

A trunk circuit control arrangement for a communication switching system having a common control unit includes duplicate trunk control highway circuits controlled by the common control unit for each of a plurality of trunk circuits to provide control signals for enabling control relays of the trunk circuits of each group to be selectively energized to establish different control states for the trunk circuits. Each trunk circuit includes a select relay the operation of which is controlled by the common control unit to permit the control relays of a selected trunk circuit to be connected to the corresponding trunk control highway for operation. The trunk control highway circuits include transfer relays operable to normally set a first trunk control highway for each trunk circuit group to an active state and the second trunk control highway to a standby state and test relays which monitor the operation of the trunk control highways and effect transfer, via the common control unit from the active trunk control highway to the standby trunk control highway in the event of a fault in the active trunk control highway.

United States Patent Wunluck et al.

[111 3,909,542 1 Sept. 30, 1975 TRUNK CIRCUIT CONTROL ARRANGEMENT FOR A COMMUNICATION SWITCHING SYSTEM Inventors: Bruce R. Wunluck, Oak Lawn;

Johannes Draayer, Wheaton; John S. Young, Addison, all of lll.; John G. Van Bosse, Acton, Mass; Robert P. Douglas, Elmhurst, Ill.

Primary E.\'aminerWilliam C. Cooper Attorney, Agent, or FirmJohn T. Winburn [5 7 ABSTRACT A trunk circuit control arrangement for a communication switching system having a common control unit includes duplicate trunk control highway circuits controlled by the common control unit for each of a plurality of trunk circuits to provide control signals for enabling control relays of the trunk circuits of each group to be selectively energized to establish different control states for the trunk circuits. Each trunk circuit includes a select relay the operation of which is controlled by the common control unit to permit the control relays of a selected trunk circuit to be connected to the corresponding trunk control highway for operation. The trunk control highway circuits include transfer relays operable to normally set a first trunk control highway for each trunk circuit group to an active state and the second trunk control highway to a standby state and test relays which monitor the operation of the trunk control highways and effect transfer, via the common control unit from the active trunk control highway to the standby trunk control highway in the event of a fault in the active trunk control highway.

10 Claims, 42 Drawing Figures F TRK. HGY TRK HGY GRP l TRANS CONTROL TRANS TEST -+TH60 TRA I TTI THY l I I l sm l' 1" cu T I THYO "l' rcls TG3l l TTZ r Tl'lYl I l i 1 l 504 b cul .t THY o .rc 32 -Tc 4? TT3 THYl 1 I I ihro CPI-L v I l l i v Tn Tm Tc4a T063 TRK l s" I T222252, TTHYO I I "5 i THYI [THG4 rm ---l rc so rc I59 TRC new mes-mew *wflfluuxstrcso-rclsgi SM Cid- COMMON r rclso-rc 255 CONTROL TTll-l6 THGll-TH6I5 I (20% ROL To MAT IX l I 5 FROM sens: MATRIX TOSIGNALI NG US. Patent Sept. 30,1975

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FIG. 5

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4 WIRE ACCESS TRUNK cmcun TB.T

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$121132 MATRIX COLUMN COLUMN 001111111 COLUMN 00 (3| so 31 WDL 0Q0000 .01 31 I WDL Q1 11100 101 111.312) 1.31

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SENSE LEADS U.S. Patent Sept. 30,1975 Sheet 12 of 24 3,909,542

RR M MT 5 TCAFO TR TO SENSE EI ATEIIX [|I MR -I I- U H 2 SM TR-B I- MT2 l TR-C ----*l,. 'TMT3 SCASO HG CA TO TRUNK HIGHWAY BITS Bl9- B23 Lgg gz woo SCASI BITS sI T0 SENSE B27- B3l ]MATRIX I I GLWQ Y GROUP THG (bl BITS TO SENSE 1 MATRIX CA.

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Sheet 15 0f 24 FIG.I60

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NF SENDER OPEN OPER ATOR POSITION 

1. In a communication switching system including a switching network having a plurality of inlets and a plurality of outlets, a plurality of trunk circuits adapted to request the service of common control means for causing the establishment of paths through the switching network from the trunk circuits to predetermined outlets of said switching network, a trunk control arrangement comprising highway control means controlled by said common control means to activate a least one trunk circuit highway for providing control signals to a group of said trunk circuits over a plurality of paths common to the trunk circuits of said group and select means controlled by said common control means for effecting the connection of a preselected trunk circuit of said group to the trunk control highway to receive said control signals.
 2. In a communication switching system including a switching network having a plurality of inlets and a plurality of outlets, a plurality of trunk circuits adapted to request the service of common control means for causing the establishment of paths through the switching network from the trunk circuits to predetermined outlets of said switching network, a trunk control arrangement comprising highway control means controlled by said common control means to enable first and second trunk circuit control highways for providing control signals for a group of said trunk circuits over separate path sets, highway transfer means for setting a first one of said trunk control highways to an active state and the other of said trunk control highways to a standby state, and select means controlled by said common control means for effecting the connection of a preselected trunk circuit of said group to the path set of one trunk control highway to receive said control signals.
 3. A system as set forth in Claim 2 wherein said highway transfer means includes fault detecting means for monitoring the operation of said highway control means and for providing a fault indication to said common control in the event of a fault in said highway control means, said highway transfer means including switching means responsive to a control signal provided by said common control to set said one trunk control highway to an active state to enable said control signals to be extended to said trunk circuits over the path set of said other trunk control highway.
 4. In a communication switching system including a switching network having a plurality of inlets and a plurality of outlets, a plurality of groups of trunk circuits, the trunk circuits of each group being adapted to request the service of common control means for causing the establishment of paths through the network from the trunk circuits to predetermined outlets of said switching network, each of said trunk circuits including a plurality of control switching means selectively operable to establish a plurality of different control states for said trunk circuit, each of said trunk circuits further includIng select switching means for enabling selection of a given trunk circuit, said common control means including output means for providing a plurality of output control points including a separate group of output control points for each group of trunk circuits, highway control means connected to certain ones of said output control points of one of said groups for activating at least one trunk circuit control highway to provide control signals for operating the control switching means for the corresponding group 0f trunk circuits, the select switching means of said one group of trunk circuits being individually connected to further output control points of said one group for selective operation to connect the associated control switching means to said trunk circuit control highway to receive said control signals.
 5. A system as set forth in claim 4 wherein said highway control means provides a first and a second trunk circuit control highway, and transfer means for setting one of said trunk circuit control highways to an active state and the other of said trunk circuit control highways to a standby state.
 6. A system as set forth in claim 5 wherein said highway control means includes fault detecting means for monitoring the operation of said output means and for providing an indication to said common control means whenever a fault occurs in said output means, said transfer means including switching means enabled by said common control to set said one trunk circuit highway to a standby state and to set said other trunk circuit control highway to an active state.
 7. A system as set forth in claim 5 which includes a separate highway control means for each group of trunk circuits for providing a first and a second trunk circuit control highway for each group of trunk circuits, said transfer means being operable to set said first trunk circuit control highway to an active state and said second trunk circuit control highway to a standby state.
 8. A system as set forth in claim 7 wherein each of said highway control means includes fault detecting means, each individually operable to provide an indication to said common control whenever a fault occurs in an associated output control point, said transfer means including a plurality of switching means commonly enabled to said common control means to set the first trunk circuit control highway to a standby state and the second trunk control highway to an active state.
 9. In a communication switching system including a switching network having a plurality of inlets and a plurality of outlets, a plurality of trunk circuits adapted to request the service of common control means for causing the establishment of paths through the switching network from the trunk circuits to predetermined outlets of said switching network, a trunk circuit control arrangement comprising means controlled by said common control means to activate a trunk control highway for providing different sets of control signals for said trunk circuits to enable said trunk to be set to different circuits to ones of a plurality of control states, and select means controlled by said common control to individually connect said trunk circuits to said trunk control highway to receive said control signals.
 10. In a commmunication switching system including a switching network having a plurality of inlets and a plurality of outlets, a plurality of trunk circuits adapted to request the service of common control means for causing the establishment of paths through the switching network from the trunk circuits to predetermined outlets of said switching network, each of said trunk circuits including a plurality of control switching means selectively operable to establish a plurality of different control states for said trunk circuit, a trunk circuit control arrangement comprising means controlled by said common control means to activate a first and a second trunk circuit control highway to provide control signals for said trunk circuits selectively over separate path Sets which are common to a group of said trunk circuits highway transfer means for setting one of said trunk control highways to an active state and the other of said trunk control highways to a standby state, each of the trunk circuits of said group having an associated select switching means operable when enabled to effect the connection of each of the control switching means of the associated trunk circuit to a different path of the active trunk control highway, the select switching means of the trunk circuits of said group being selectively enabled by said common control means to permit a selected trunk circuit to be connected to said active trunk control highway. 